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From-SVN: r102074

1 files changed, 238 insertions, 0 deletions

diff --git a/libjava/classpath/java/security/cert/CertPathBuilder.java b/libjava/classpath/java/security/cert/CertPathBuilder.java
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+/* CertPathBuilder.java -- bulids CertPath objects from Certificates.
+   Copyright (C) 2003, 2004  Free Software Foundation, Inc.
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+ 
+GNU Classpath is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version. */
+
+
+package java.security.cert;
+
+import gnu.java.security.Engine;
+
+import java.security.InvalidAlgorithmParameterException;
+import java.security.NoSuchAlgorithmException;
+import java.security.NoSuchProviderException;
+import java.security.Provider;
+import java.security.Security;
+
+/**
+ * This class builds certificate paths (also called certificate chains),
+ * which can be used to establish trust for a particular certificate by
+ * building a path from a trusted certificate (a trust anchor) to the
+ * untrusted certificate.
+ *
+ * @see CertPath
+ */
+public class CertPathBuilder
+{
+
+  // Constants and fields.
+  // ------------------------------------------------------------------------
+
+  /** Service name for CertPathBuilder. */
+  private static final String CERT_PATH_BUILDER = "CertPathBuilder";
+
+  /** The underlying implementation. */
+  private CertPathBuilderSpi cpbSpi;
+
+  /** The provider of this implementation. */
+  private Provider provider;
+
+  /** The name of this implementation. */
+  private String algorithm;
+
+  // Constructor.
+  // ------------------------------------------------------------------------
+
+  /**
+   * Creates a new CertPathBuilder.
+   *
+   * @param cpbSpi    The underlying implementation.
+   * @param provider  The provider of the implementation.
+   * @param algorithm This implementation's name.
+   */
+  protected CertPathBuilder(CertPathBuilderSpi cpbSpi, Provider provider,
+                            String algorithm)
+  {
+    this.cpbSpi = cpbSpi;
+    this.provider = provider;
+    this.algorithm = algorithm;
+  }
+
+  // Class methods.
+  // ------------------------------------------------------------------------
+
+  /**
+   * Get the default cert path builder type.
+   *
+   * <p>This value can be set at run-time by the security property
+   * <code>"certpathbuilder.type"</code>. If this property is not set,
+   * then the value returned is <code>"PKIX"</code>.
+   *
+   * @return The default CertPathBuilder algorithm.
+   */
+  public static final String getDefaultType()
+  {
+    String type = Security.getProperty("certpathbuilder.type");
+    if (type == null)
+      type = "PKIX";
+    return type;
+  }
+
+  /**
+   * Get an instance of a named CertPathBuilder, from the first provider
+   * that implements it.
+   *
+   * @param algorithm The name of the CertPathBuilder to create.
+   * @return The new instance.
+   * @throws NoSuchAlgorithmException If no installed provider
+   *   implements the named algorithm.
+   */
+  public static CertPathBuilder getInstance(String algorithm)
+    throws NoSuchAlgorithmException
+  {
+    Provider[] p = Security.getProviders();
+
+    for (int i = 0; i < p.length; i++)
+      {
+        try
+          {
+            return getInstance(algorithm, p[i]);
+          }
+        catch (NoSuchAlgorithmException e)
+          {
+	    // Ignored.
+          }
+      }
+
+    throw new NoSuchAlgorithmException(algorithm);
+  }
+
+  /**
+   * Get an instance of a named CertPathBuilder from the named
+   * provider.
+   *
+   * @param algorithm The name of the CertPathBuilder to create.
+   * @param provider  The name of the provider from which to get the
+   *   implementation.
+   * @return The new instance.
+   * @throws NoSuchAlgorithmException If no installed provider
+   *   implements the named algorithm.
+   * @throws NoSuchProviderException If the named provider does not
+   *   exist.
+   */
+  public static CertPathBuilder getInstance(String algorithm, String provider)
+    throws NoSuchAlgorithmException, NoSuchProviderException
+  {
+    Provider p = Security.getProvider(provider);
+    if (p == null)
+      throw new NoSuchProviderException(provider);
+    return getInstance(algorithm, p);
+  }
+
+  /**
+   * Get an instance of a named CertPathBuilder from the specified
+   * provider.
+   *
+   * @param algorithm The name of the CertPathBuilder to create.
+   * @param provider  The provider from which to get the implementation.
+   * @return The new instance.
+   * @throws NoSuchAlgorithmException If no installed provider
+   *   implements the named algorithm.
+   * @throws IllegalArgumentException If <i>provider</i> in
+   *   <tt>null</tt>.
+   */
+  public static CertPathBuilder getInstance(String algorithm, Provider provider)
+    throws NoSuchAlgorithmException
+  {
+    if (provider == null)
+      throw new IllegalArgumentException("null provider");
+    try
+      {
+        return new CertPathBuilder((CertPathBuilderSpi)
+          Engine.getInstance(CERT_PATH_BUILDER, algorithm, provider),
+          provider, algorithm);
+      }
+    catch (java.lang.reflect.InvocationTargetException ite)
+      {
+        throw new NoSuchAlgorithmException(algorithm);
+      }
+    catch (ClassCastException cce)
+      {
+        throw new NoSuchAlgorithmException(algorithm);
+      }
+  }
+
+  // Instance methods.
+  // ------------------------------------------------------------------------
+
+  /**
+   * Return the name of this CertPathBuilder algorithm.
+   *
+   * @return The algorithm name.
+   */
+  public final String getAlgorithm()
+  {
+    return algorithm;
+  }
+
+  /**
+   * Return the provider of this instance's implementation.
+   *
+   * @return The provider.
+   */
+  public final Provider getProvider()
+  {
+    return provider;
+  }
+
+  /**
+   * Builds a certificate path. The {@link CertPathParameters} parameter
+   * passed to this method is implementation-specific, but in general
+   * should contain some number of certificates and some number of
+   * trusted certificates (or "trust anchors").
+   *
+   * @param params The parameters.
+   * @retrun The certificate path result.
+   * @throws CertPathBuilderException If the certificate path cannot be
+   *   built.
+   * @throws InvalidAlgorithmParameterException If the implementation
+   *   rejects the specified parameters.
+   */
+  public final CertPathBuilderResult build(CertPathParameters params)
+    throws CertPathBuilderException, InvalidAlgorithmParameterException
+  {
+    return cpbSpi.engineBuild(params);
+  }
+}